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STMicroelectronics T850H-6I
- Part No.:
- T850H-6I
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
T850H-6I.pdf
- Description:
- TRIAC ALTERNISTOR 600V 8A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:4,869
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Product details
Overview
T850H-6I from STMicroelectronics is a high-temperature, snubberless 8 A triac in insulated TO-220AB package, rated for 600 V repetitive peak off-state voltage (VDRM/VRRM), 50 mA maximum gate trigger current (IGT), and 150 °C maximum junction temperature. It delivers robust 3-quadrant commutation and low thermal resistance (Rth(j-c) = 3.7 °C/W), enabling reliable AC mains switching in universal motor control.
For engineers reviewing the T850H-6I datasheet, T850H-6I pinout, T850H-6I application, or T850H-6I equivalent, this part is selected for high-power-density motor drives where thermal margin, snubberless operation, and UL-certified insulation are critical design requirements.
Technical Context
This triac operates as a bidirectional AC power switch with insulated mounting capability, supporting full-cycle phase-control and zero-crossing triggering in resistive and inductive loads. Its internal ceramic pad provides 2500 VRMS isolation between the heatsink and main terminals, eliminating need for insulating washers in chassis-grounded systems.
The device achieves 150 °C turn-off commutation stability without external snubbers due to high dV/dt (1500 V/µs at Tj = 150 °C) and high (dI/dt)c (14 A/ms at Tj = 150 °C), making it suitable for fast-switching universal motors with high inrush and back-EMF transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 8 A RMS on-state current at TC = 116 °C - supports continuous 1 kW+ AC loads with moderate heatsinking |
| VDRM / VRRM | 600 V - withstands 230 VAC mains with ≥2× safety margin against line surges |
| IGT (max) | 50 mA - compatible with standard microcontroller GPIO or low-power driver ICs without buffer stages |
| dV/dt (min) | 1500 V/µs at Tj = 150 °C - prevents false triggering during rapid voltage transients in noisy motor environments |
| (dI/dt)c (min) | 14 A/ms at Tj = 150 °C - ensures reliable commutation during high di/dt load current decay in universal motors |
| Rth(j-c) | 3.7 °C/W - enables compact heatsink design vs. non-insulated packages requiring additional isolation layers |
| Isolation Voltage | 2500 VRMS - satisfies reinforced insulation requirements for Class I appliances per IEC 60335 |
Pinout & Package
Package: TO-220AB Insulated - thermally conductive but electrically isolated tab (A2) mounted directly to chassis ground; plastic body with metal tab encapsulated in insulating material.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | Main Terminal 1 (Anode 1) | Reference terminal for gate drive; connected to load return or neutral side in single-phase AC circuits |
| A2 | Main Terminal 2 (Anode 2) | Electrically isolated high-current output terminal; mounts to heatsink/chassis without insulator |
| G | Gate | Low-energy trigger input; requires ≤50 mA pulse to initiate conduction in all three quadrants |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless operation | Eliminates external RC snubber components in universal motor phase-control circuits, reducing BOM count and PCB area |
| 150 °C junction rating | Enables sustained operation in sealed enclosures (e.g., vacuum cleaner housings) without derating below 8 A RMS |
| UL certification (E81734) | Validated for end-equipment safety compliance in household appliances without additional system-level isolation testing |
| Low Rth(j-c) = 3.7 °C/W | Reduces required heatsink mass by ~40% compared to standard TO-220AB triacs with similar current rating |
| High 3-quadrant commutation | Guarantees reliable turn-off under inductive load conditions across all gate-trigger polarities, simplifying driver design |
Applications
| Vacuum Cleaner Motor Control | Washing Machine Drum Drive |
|---|---|
Use Scenario: Phase-controlled speed regulation of brushed universal motors in portable vacuum cleaners with sealed thermal enclosures. IC Role / Device Role / Timing Role: Main AC power switch enabling variable-speed motor operation via leading-edge phase-cut dimming. Use Value: Snubberless design reduces component count; 150 °C rating avoids thermal shutdown during sustained high-load cleaning cycles. |
Use Scenario: Bidirectional AC switching for reversible drum motor in front-loading washing machines with high ambient cabinet temperatures. IC Role / Device Role / Timing Role: High-reliability AC power controller handling frequent direction reversal and high inrush currents. Use Value: Insulated TO-220AB package allows direct chassis mounting while meeting IEC 60335 reinforced insulation requirements. |
| Power Tool Speed Regulation | Industrial Fan Speed Control |
Use Scenario: Variable-speed control of universal motors in corded power tools (drills, sanders) subject to mechanical vibration and thermal cycling. IC Role / Device Role / Timing Role: Robust mains-switching element tolerant of EMI-rich environments and repeated hot/cold transitions. Use Value: 14 A/ms (dI/dt)c ensures clean commutation during abrupt speed changes; UL certification supports tool safety certification. |
Use Scenario: Energy-efficient AC fan control in HVAC systems operating continuously at elevated ambient temperatures (>60 °C). IC Role / Device Role / Timing Role: Thermally stable AC power switch managing 230 VAC loads up to 1.8 kW with minimal heatsink. Use Value: 3.7 °C/W Rth(j-c) enables passive cooling solutions; 150 °C Tj rating maintains 8 A capacity even at high ambient temps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac-based AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTA212-600BWRG | 600 V VDRM, 12 A IT(RMS), non-insulated TO-220, higher IGT (50 mA same), Rth(j-c) = 1.5 °C/W | Requires external insulator for chassis mounting; better for high-current, low-thermal-resistance designs with space for isolation hardware | Select when maximum current headroom and lowest thermal resistance are prioritized over integrated insulation |
| BTB24-600CW | 600 V VDRM, 24 A IT(RMS), insulated TO-220, IGT = 50 mA, Rth(j-c) = 2.5 °C/W, no UL certification | Higher current rating but lacks UL file E81734; suited for industrial equipment where agency certification is not mandated | Select when >12 A RMS load current is required and UL certification is not required for end-product approval |
Compared with BTA212-600BWRG and BTB24-600CW, T850H-6I trades some current headroom and thermal performance for certified reinforced insulation and guaranteed snubberless operation at 150 °C - making it optimal for cost-sensitive, safety-critical consumer appliance designs.
Availability
T850H-6I is available at Aetrix Electronics and suitable for vacuum cleaner motor control, washing machine drum drives, and power tool speed regulation requiring stable component supply and long-term lifecycle support.
Supply support for T850H-6I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
T850H-6I belongs to ST's Snubberless™ Triac product line, engineered specifically for high-reliability, high-temperature AC power control in space-constrained and thermally demanding home appliance motor applications.
FAQ
What is the maximum allowable case temperature for continuous 8 A RMS operation?
The T850H-6I supports 8 A RMS continuous current at TC = 116 °C, as specified in Table 2 of the datasheet. Exceeding this case temperature requires linear derating per Figure 2; operation above 116 °C reduces RMS current capability to maintain Tj ≤ 150 °C.
Does the insulated TO-220AB package eliminate the need for a mica washer or silicone pad?
Yes - the TO-220AB Insulated package integrates a ceramic isolation layer between the metal tab (A2) and the die, providing 2500 VRMS isolation. No external insulator is required when mounting to a grounded heatsink or chassis, provided mechanical stress and creepage distances comply with IEC 60335.
Can T850H-6I replace T835H-6I in existing designs?
Yes, with functional trade-offs: T850H-6I has higher IGT (50 mA vs. 35 mA), higher IH (75 mA vs. 35 mA), and higher (dI/dt)c (14 A/ms vs. 11 A/ms). Gate drive circuitry must supply ≥50 mA, but improved commutation margin may simplify snubber design in high-inductance loads.
Is this triac suitable for zero-crossing switching applications?
No - T850H-6I is optimized for phase-control (leading-edge) switching. Its high dV/dt immunity and snubberless design target inductive loads with high di/dt, not zero-crossing logic. For zero-crossing, ST recommends Z01xxMN series opto-triacs or dedicated zero-crossing IC drivers.
T850H-6I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 600 V
- Current - On State (It (RMS)) (Max):
- 8 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 80A, 84A
- Current - Gate Trigger (Igt) (Max):
- 50 mA
- Current - Hold (Ih) (Max):
- 75 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
T850H-6I FAQ
1.How can I place an order for T850H-6I through Aetrix?
Please submit a Request for Quotation (RFQ) for T850H-6I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for T850H-6I reliable?
The price and inventory of T850H-6I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for T850H-6I is usually 5 days.
3.What payment methods are accepted for T850H-6I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for T850H-6I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for T850H-6I?
T850H-6I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your T850H-6I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for T850H-6I?
For technical support, including T850H-6I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your T850H-6I requirements.
6.How does Aetrix verify that T850H-6I is sourced from the original manufacturer or authorized distributors?
All T850H-6I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that T850H-6I meets industry standards.
7.What is the process for return or replacement of T850H-6I?
All T850H-6I units undergo pre-shipment inspection (PSI). If there is an issue with T850H-6I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The T850H-6I part is unused and in its original packaging.
Return procedure for T850H-6I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
T850H-6I Tags
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Z0103NN5AA4
STMicroelectronics
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Z0103MNT1G
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BTA08-600CWRG
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T835H-6G-TR
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